I am not sure I understand your question, but assuming you want to know about discards, here is some info:

All network devices can discard packets, and are expected to. For example, a switch can discard packets that arrive tagged for a specific virtual LAN (VLAN) on a port not configured for that VLAN. Also most devices will discard packets when they run low on buffer memory.

Some discarding is inevitable, but excessive discards can indicate that the switch is misconfigured (e.g. it doesn't have a VLAN on it that it should have), or that the device sending to it is misconfigured (trying to send to the wrong VLAN).